Contact local shelters & rescues.
Put Flyers EVERYWHERE!!
My 2 went missing and are both timid and I knew no one would even be able to catch them and read their tags. So I depended on flyers and that's brought them home! A little girl saw their picture in the post office and told her mom she saw them in their back yard the night before!!!

I even spoke to the people at the post office and gave them a picture to hang in their back room so the postmen/women that were out all day long delivery mail would be on the look out for them too!
I placed an ad in the newspaper too.

I pray for his safe return.